Energy of an EMR of wavelength 450nm is
Answers
If the wavelength is given, the energy can be determined by first using the wave equation (c = λ × ν) to find the frequency, then using Planck's equation to calculate energy. Use the equations above to answer the following questions.
Answer:
The energy of the EMR is 44.2 * 10^-20 J.
Explanation:
According to the Planck - Einstein's equation, the energy of an EMR is proportional to its frequency and is given as : E = h. ν, where E is the energy, h is the Planck's constant( value is 6.626 * 10^-34 Js) and ν is the frequency of the wave/particle.
The wavelength(λ) of the EMR is given as 450nm( or 450*10^-9 m).
Frequency, wavelength and speed of light are related as:
c = λ* ν ( c is 3*10^8 m/s)
So, ν = 6.67* 10^14 s^-1
Therefore, the energy is:
E=( 6.626 * 10^-34 ) *( 6.67* 10^14 ) = 44.2 * 10^-20 J.